Knee pillow



FIG. 1 is a perspective view of a knee pillow of the present invention;

FIG. 2 is a right side view of the knee pillow;

FIG. 3 is a left side view of the knee pillow;

FIG. 4 is a bottom end view of the knee pillow;

FIG. 5 is a top end view of the knee pillow;

FIG. 6 is a front view of the knee pillow; and,

FIG. 7 is a rear view of the knee pillow.

The portions shown in broken lines form no part of the claimed design. 

The ornamental design for a knee pillow, as shown and described. 